Dyeing vegetable fibers.



many valuable commercial advent-ages overtJNlTE-D sfrnriss irnfrsntr orrion JUSERHZ TURNER AND HARRY DEAN, 01E HUDDELBSFIELD, ENGLAND, ASSIGIIORS TO READ HOLLIDAY ct SONS, LilIk, 0F 'IURITBP'CDGE, HUDDERSFIELD, ENGLAND.

DYEING VEGETABLE FIBERS.

No Drawing.

Specification of Letters E'atent. Application mm March 31, 1913. Serial No. 757,737.

Patelitod Mar. iii, tilt-ll.

To all whom itmag concern Be it known that we, Josnru TURNER and HARRY DEAN, subjects of King George V of Great Britain, and residents of Huddersfield, in the county of York, England, have invented certain new and useful Improve ments in Dyeing Vegetable Fibers, of which the following is a specification.-

Our invention relates to a new and useful method for dyeing cotton fibers which have been previously dyed with the substantive or direct dyeing cotton colors, and to the new and useful products produced thereby.

We have discovered that cotton which has been dyed With the substantive or direct dyeing cotton colors can be after-treatcd with certain amino compounds, and in such a manner that the produced results have the untreated or original dyein Our process, in general, consists in treatipg cotton dyed with the substantive or direct dyeing cotton colors with certain amino compounds in the presence of an oxidizing agent. Amen the amino compounds which we have employed for the production of these new and Valuable results are: parsphenylenediamin; p-emidop-oxydiphenyh aniin; poromidophcnol orthoamidophenol homologues of the tore-mentioned, and the following condensation products which are described in English Patent No. 15008, of 1908, viz: paraphenylenediamin and 1 mol. na'phthol; paraphenylcnediamin and 2 mols. naphthol; parcphenylenediamin and 1 mol. phenol; paraphonylencdiamin and 2 mols. phenol; paraphenylenediamin and 1 or 2 mols. cresol; paraphenylencdianiin and 1 or 2 mols. metuphenylene or toluylanediuinin.

In order to produce varied results the above amino compounds may be used singly or in combination with each other.

One method of following our process is as follows: Cotton which has been dyed with 3% of a direct dyeing cotton color, such as titan black, is worked in a bath containing -3 orthoamidophenol, 2 0 phenol. 20 ports of water, 3% acetic acid (50%), 1% bichromate of soda, -for a few minutes in the cold and then gradually raised to 40 C. during about halfun. hodm The operation may also be conducted in the cold throughout or the temperature may be raised to boiling point.

lVc do not limit ourselves to the exact proportions given above, all 01'' which may be varied without going beyond the scope of our invention.

The herein described method of treatment produ es results possessing decidedly different and more Valuable properties than those of the original dyed cotton, tunouti' which are their increased intensity and beauty of shade and their improved fastness to light and milling.

By substantive or direct dyeine; cotton colors we mean those dyestuffs which do not need the intervention of a mordant but which can be dyed successfully upon vegetable fibers in an aqueous bath with or with out the addition of salt.

Having thus described our invention, what, we claim is:

1. The process of treating dyed cottonwhich comprises subjecting cotton previoust," dyed with a substantive -color to a; bath containing an oxidizing agent and an amino compound.

The process of treating dyed cotton which. comprises subjecting cotton previously dyed with a substantive color to an acid bath containin r an oxidizing agent and an-amiuo compoun The process of treating dyed cotton which comprises subjecting cotton previously dyed with a substantive color to a bath containing an oxidizing agent and a mixture of amino compounds.

4. The process of treating dyed cotton which comprises subjecting cotton prcviously dyed with afsubstantivc color to an acid bath containin bichromate of soda and an amino compoun i Signed at Huddersfield, in county of York, England, this 18th day of March, A. D. 1913.

' JOSEPH TURNER. HARRY DEAN.

lVi tuesscs FRANKLIN D. HALE, JOHN R. BAALAM. 

